Disable session timeouts for now, by default, to avoid #2792.

Fixes #2792.
Removed cell-content class which was giving dot ellipsis in viewing the playlist on homepage and  assigned playlistd table width increased to 100%
Playlist Exercise on Refresh stays on same page, now doesn't reset to first exercise
Playlist Updated -- Multiplication Division Grade 4 Slug Fixed
Merge pull request #2814 from anuragkanungo/playlist_slug_fix

Playlist Updated -- Multiplication Division Grade 4 Slug Fixed
Merge pull request #2806 from anuragkanungo/playlist_refresh

#2797 - Playlist Exercise on Refresh stays on same page, now doesn't reset to first exercise
Merge pull request #2801 from jamalex/2792

Disable session timeouts for now, by default, to avoid #2792.
Merge pull request #2804 from anuragkanungo/nalanda-rct3

#2798 - Removed cell-content class which was giving dot ellipsis